Jōzai Domain

Overview

Jōzai Domain (請西藩, Jōzai-han) was a small feudal domain of Edo-period Japan, established in 1825 and located in Kazusa Province, which corresponds to the central and southern part of modern Chiba Prefecture. Its administrative seat was a jin'ya (陣屋, jin'ya — a fortified administrative headquarters, smaller than a castle) at Mafune, in what is now the city of Kisarazu. The domain was held throughout its existence by a branch of the Mizuno clan (水野氏, Mizuno-shi). Though modest in size, Jōzai is remembered chiefly for the role its last lord played at the very end of the Tokugawa order, during the Boshin War of 1868–1869.

History

Jōzai Domain was founded in 1825, in the eighth year of the Bunsei era (文政, Bunsei — the era name in use from 1818 to 1830). It came into being as a grant to a branch of the Mizuno, a family with deep roots in Tokugawa service; the Mizuno had long supplied senior retainers to the shogunate. The new domain was carved out within Kazusa Province, on the Bōsō Peninsula across Tokyo Bay from the shogunal capital at Edo.

For most of its life Jōzai was a quiet, small holding. Its significance belongs almost entirely to its final years. When the Boshin War broke out in 1868 — the civil conflict between the forces loyal to the Tokugawa shogunate and those backing the imperial restoration — the domain's last lord, Mizuno Tadanori (水野忠徳), chose to fight on the shogunal side. Jōzai was consequently among the domains punished by the new imperial government after the Tokugawa defeat: its lord was stripped of his rank and holdings, and the domain was abolished. The Meiji Restoration's reorganisation of the country into prefectures soon swept away the domain system altogether.

Territory and Influence

Jōzai was a small domain, and its territory lay within Kazusa Province on the Bōsō Peninsula. Its capital was at Mafune, and the domain is also associated with Kisarazu, the castle town that became the modern city of the same name. The domain's seat was a jin'ya rather than a castle, a marker of its modest standing: only domains above a certain size were permitted castles, and smaller ones administered their lands from such headquarters.

Because of its size, Jōzai exercised little weight in the politics of the Edo period as a whole. Its influence was concentrated in a single dramatic moment — the decision of its lord to side with the shogunate in 1868 — and in the consequences that followed. The domain's fate illustrates how even small domains were drawn into the national crisis of the Meiji Restoration, and how loyalty to the old order could cost a lord everything.

The Name in Japanese

The domain's name is written 請西藩 and read じょうざいはん in kana; in romaji it is Jōzai-han. The long vowel in "Jō" is a single sustained "o" sound, and the "zai" is pronounced like the English "zai" in "zai-".

Breaking the name down character by character:

• 請 — read じょう (jō) here. The character means "to request", "to invite", or "to ask for". In this name it functions as part of the place name Jōzai rather than as an ordinary word.
• 西 — read ざい (zai) here. The character means "west". It is far more commonly read nishi (にし) when it stands alone, so the reading zai is specific to this name.
• 藩 — read はん (han). This is the standard character for "domain": the feudal territories of the Edo period, each governed by a daimyō (大名, daimyō — a lord holding a domain of sufficient size). Every domain name in Japanese ends in 藩, so learning this character unlocks a whole vocabulary of Edo-period geography.

Note that 請西 is a place name, and place names in Japanese frequently use readings that differ from the everyday readings of their characters — a common trap for learners. The safest approach is to memorise 請西藩 as a unit: じょうざいはん, Jōzai-han.

Legacy

Jōzai Domain's legacy rests on its final act. Mizuno Tadanori's decision to stand with the Tokugawa shogunate in the Boshin War, and the abolition of the domain that followed the shogunal defeat, made Jōzai an example of the small domains that were destroyed by their loyalty to the old regime. The domain's lands passed into the new administrative order of the Meiji state, and its headquarters at Mafune survives as a place name within modern Kisarazu, Chiba Prefecture. For students of Japanese history and language alike, Jōzai is a compact case study: a minor Edo-period domain whose name, with its unusual readings, preserves the memory of a brief and consequential existence.